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Character selection and the quantification of morphological disparity

Published online by Cambridge University Press:  06 December 2016

Bradley Deline  and
William I. Ausich
Bradley Deline
Affiliation:
Department of Geosciences, University of West Georgia, 1601 Maple Street, Carrollton, Georgia 30118, U.S.A. E-mail: bdeline@westga.edu
William I. Ausich
Affiliation:
School of Earth Sciences, Ohio State University, 155 South Oval Mall, Columbus, Ohio 43210, U.S.A. E-mail: ausich.1@osu.edu
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Abstract

A priori choices in the detail and breadth of a study are important in addressing scientific hypotheses. In particular, choices in the number and type of characters can greatly influence the results in studies of morphological diversity. A new character suite was constructed to examine trends in the disparity of early Paleozoic crinoids. Character-based rarefaction analysis indicated that a small subset of these characters (~20% of the complete data set) could be used to capture most of the properties of the entire data set in analyses of crinoids as a whole, noncamerate crinoids, and to a lesser extent camerate crinoids. This pattern may be the result of the covariance between characters and the characterization of rare morphologies that are not represented in the primary axes in morphospace. Shifting emphasis on different body regions (oral system, calyx, periproct system, and pelma) also influenced estimates of relative disparity between subclasses of crinoids. Given these results, morphological studies should include a pilot analysis to better examine the amount and type of data needed to address specific scientific hypotheses.

Type
Articles
Information
Paleobiology , Volume 43 , Issue 1 , February 2017 , pp. 68 - 84
Copyright
Copyright © 2016 The Paleontological Society. All rights reserved 

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